diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index 3ccf133f..ac246c3e 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -38,5 +38,5 @@ filter:
 
 build_failure_conditions:
     - 'project.metric("scrutinizer.quality", < 9.30)'
-    - 'project.metric("scrutinizer.test_coverage", < 0.70)'
-    - 'project.metric_change("scrutinizer.test_coverage", < 0.01)'
\ No newline at end of file
+    - 'project.metric("scrutinizer.test_coverage", < 0.73)'
+    - 'project.metric_change("scrutinizer.test_coverage", < -0.01)'
\ No newline at end of file
diff --git a/README.md b/README.md
index bb6bb6bc..0754f280 100644
--- a/README.md
+++ b/README.md
@@ -57,8 +57,9 @@ cd kimai2/
 
 Make sure the [file permissions are correct](https://symfony.com/doc/current/setup/file_permissions.html) and create your `.env` file:
 ```bash
-chown -R www-data var/
-chmod -R 777 var/
+chown -R :www-data .
+chmod -R g+r .
+chmod -R g+rw var/
 cp .env.dist .env
 ```
 
diff --git a/src/Controller/InvoiceController.php b/src/Controller/InvoiceController.php
index 1fe9ccbb..74580ecc 100644
--- a/src/Controller/InvoiceController.php
+++ b/src/Controller/InvoiceController.php
@@ -77,6 +77,7 @@ class InvoiceController extends AbstractController
 
     /**
      * @Route(path="/", name="invoice", methods={"GET"})
+     * @Security("is_granted('view', 'invoice')")
      *
      * @param Request $request
      * @return \Symfony\Component\HttpFoundation\Response
@@ -110,6 +111,7 @@ class InvoiceController extends AbstractController
 
     /**
      * @Route(path="/print", name="invoice_print", methods={"GET"})
+     * @Security("is_granted('create', 'invoice')")
      *
      * @param Request $request
      * @return \Symfony\Component\HttpFoundation\Response
@@ -209,8 +211,7 @@ class InvoiceController extends AbstractController
     /**
      * @Route(path="/template", defaults={"page": 1}, name="admin_invoice_template", methods={"GET", "POST"})
      * @Route(path="/template/page/{page}", requirements={"page": "[1-9]\d*"}, name="admin_invoice_template_paginated", methods={"GET", "POST"})
-     *
-     * TODO permission
+     * @Security("is_granted('view', 'invoice_template')")
      *
      * @param $page
      * @return \Symfony\Component\HttpFoundation\Response
@@ -227,8 +228,7 @@ class InvoiceController extends AbstractController
 
     /**
      * @Route(path="/template/{id}/edit", name="admin_invoice_template_edit", methods={"GET", "POST"})
-     *
-     * TODO permission
+     * @Security("is_granted('edit', template)")
      *
      * @param InvoiceTemplate $template
      * @param Request $request
@@ -242,8 +242,7 @@ class InvoiceController extends AbstractController
 
     /**
      * @Route(path="/template/create", name="admin_invoice_template_create", methods={"GET", "POST"})
-     *
-     * TODO permission
+     * @Security("is_granted('create', 'invoice_template')")
      *
      * @param Request $request
      * @return \Symfony\Component\HttpFoundation\Response
@@ -261,9 +260,8 @@ class InvoiceController extends AbstractController
     /**
      * The route to delete an existing template.
      *
-     * TODO permission
-     *
      * @Route(path="/template/{id}/delete", name="admin_invoice_template_delete", methods={"GET", "POST"})
+     * @Security("is_granted('delete', template)")
      *
      * @param InvoiceTemplate $template
      * @param Request $request
diff --git a/src/Security/AclDecisionManager.php b/src/Security/AclDecisionManager.php
new file mode 100644
index 00000000..2ee17015
--- /dev/null
+++ b/src/Security/AclDecisionManager.php
@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Security;
+
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
+
+class AclDecisionManager
+{
+    /**
+     * @var AccessDecisionManagerInterface
+     */
+    protected $decisionManager;
+
+    /**
+     * AbstractVoter constructor.
+     * @param AccessDecisionManagerInterface $decisionManager
+     */
+    public function __construct(AccessDecisionManagerInterface $decisionManager)
+    {
+        $this->decisionManager = $decisionManager;
+    }
+
+    /**
+     * @param TokenInterface $token
+     * @return bool
+     */
+    public function isFullyAuthenticated(TokenInterface $token)
+    {
+        if ($this->decisionManager->decide($token, ['IS_AUTHENTICATED_FULLY'])) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param TokenInterface $token
+     * @param string|array $roles
+     * @return bool
+     */
+    public function hasRole(TokenInterface $token, $roles)
+    {
+        if (!is_array($roles)) {
+            $roles = [$roles];
+        }
+
+        if ($this->decisionManager->decide($token, $roles)) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/src/Voter/AbstractVoter.php b/src/Voter/AbstractVoter.php
index edb17241..b9eda969 100644
--- a/src/Voter/AbstractVoter.php
+++ b/src/Voter/AbstractVoter.php
@@ -9,8 +9,8 @@
 
 namespace App\Voter;
 
+use App\Security\AclDecisionManager;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
 use Symfony\Component\Security\Core\Authorization\Voter\Voter;
 
 /**
@@ -19,15 +19,15 @@ use Symfony\Component\Security\Core\Authorization\Voter\Voter;
 abstract class AbstractVoter extends Voter
 {
     /**
-     * @var AccessDecisionManagerInterface
+     * @var AclDecisionManager
      */
     protected $decisionManager;
 
     /**
      * AbstractVoter constructor.
-     * @param AccessDecisionManagerInterface $decisionManager
+     * @param AclDecisionManager $decisionManager
      */
-    public function __construct(AccessDecisionManagerInterface $decisionManager)
+    public function __construct(AclDecisionManager $decisionManager)
     {
         $this->decisionManager = $decisionManager;
     }
@@ -38,11 +38,7 @@ abstract class AbstractVoter extends Voter
      */
     protected function isFullyAuthenticated(TokenInterface $token)
     {
-        if ($this->decisionManager->decide($token, ['IS_AUTHENTICATED_FULLY'])) {
-            return true;
-        }
-
-        return false;
+        return $this->decisionManager->isFullyAuthenticated($token);
     }
 
     /**
@@ -52,10 +48,6 @@ abstract class AbstractVoter extends Voter
      */
     protected function hasRole($role, TokenInterface $token)
     {
-        if ($this->decisionManager->decide($token, [$role])) {
-            return true;
-        }
-
-        return false;
+        return $this->decisionManager->hasRole($token, [$role]);
     }
 }
diff --git a/src/Voter/InvoiceVoter.php b/src/Voter/InvoiceVoter.php
new file mode 100644
index 00000000..e3357f18
--- /dev/null
+++ b/src/Voter/InvoiceVoter.php
@@ -0,0 +1,136 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Voter;
+
+use App\Entity\InvoiceTemplate;
+use App\Entity\User;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+
+/**
+ * A voter to check permissions on Invoices.
+ */
+class InvoiceVoter extends AbstractVoter
+{
+    public const VIEW = 'view';
+    public const EDIT = 'edit';
+    public const CREATE = 'create';
+    public const DELETE = 'delete';
+
+    public const ALLOWED_ATTRIBUTES = [
+        self::VIEW,
+        self::CREATE,
+        self::EDIT,
+        self::DELETE
+    ];
+
+    public const ALLOWED_SUBJECTS = [
+        'invoice',
+        'invoice_template'
+    ];
+
+    /**
+     * @param string $attribute
+     * @param mixed $subject
+     * @return bool
+     */
+    protected function supports($attribute, $subject)
+    {
+        if (!in_array($attribute, self::ALLOWED_ATTRIBUTES)) {
+            return false;
+        }
+
+        if (!$subject instanceof InvoiceTemplate) {
+            if (!is_string($subject) || !in_array($subject, self::ALLOWED_SUBJECTS)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * @param string $attribute
+     * @param string|InvoiceTemplate $subject
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
+    {
+        $user = $token->getUser();
+
+        if (!$user instanceof User) {
+            return false;
+        }
+
+        switch ($attribute) {
+            case self::VIEW:
+                return $this->canView($user, $token);
+            case self::CREATE:
+                return $this->canCreate($user, $token);
+            case self::EDIT:
+                return $this->canEdit($user, $token);
+            case self::DELETE:
+                return $this->canDelete($token);
+        }
+
+        return false;
+    }
+
+    /**
+     * @param User $user
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function canView(User $user, TokenInterface $token)
+    {
+        if ($this->canEdit($user, $token)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param User $user
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function canCreate(User $user, TokenInterface $token)
+    {
+        if ($this->canDelete($token)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param User $user
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function canEdit(User $user, TokenInterface $token)
+    {
+        if ($this->canDelete($token)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function canDelete(TokenInterface $token)
+    {
+        return $this->isFullyAuthenticated($token) && $this->hasRole('ROLE_TEAMLEAD', $token);
+    }
+}
diff --git a/tests/Voter/InvoiceVoterTest.php b/tests/Voter/InvoiceVoterTest.php
new file mode 100644
index 00000000..9c75fa8f
--- /dev/null
+++ b/tests/Voter/InvoiceVoterTest.php
@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Voter;
+
+use App\Entity\InvoiceTemplate;
+use App\Entity\User;
+use App\Security\AclDecisionManager;
+use App\Voter\InvoiceVoter;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
+use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
+
+/**
+ * @covers \App\Voter\InvoiceVoter
+ */
+class InvoiceVoterTest extends TestCase
+{
+    /**
+     * @dataProvider getTestData
+     */
+    public function testVote(User $user, $isAuthenticated, $hasRole, $subject, $attribute, $result)
+    {
+        $token = new UsernamePasswordToken($user, 'foo', 'bar', $user->getRoles());
+
+        $accessManager = $this->getMockBuilder(AclDecisionManager::class)->disableOriginalConstructor()->getMock();
+        $accessManager->method('isFullyAuthenticated')->willReturn($isAuthenticated);
+        $accessManager->method('hasRole')->willReturn($hasRole);
+
+        $sut = new InvoiceVoter($accessManager);
+
+        $this->assertEquals($result, $sut->vote($token, $subject, [$attribute]));
+    }
+
+    public function getTestData()
+    {
+        $user0 = $this->getUser(0, User::ROLE_CUSTOMER);
+        $user1 = $this->getUser(1, User::ROLE_USER);
+        $user2 = $this->getUser(1, User::ROLE_TEAMLEAD);
+        $user3 = $this->getUser(1, User::ROLE_ADMIN);
+        $user4 = $this->getUser(1, User::ROLE_SUPER_ADMIN);
+
+        $users = [$user0, $user1, $user2, $user3, $user4];
+        $attributes = [InvoiceVoter::VIEW, InvoiceVoter::CREATE, InvoiceVoter::EDIT, InvoiceVoter::DELETE];
+        $subjects = ['invoice', 'invoice_template', new InvoiceTemplate()];
+
+        foreach ($attributes as $attribute) {
+            foreach ($users as $user) {
+                foreach ($subjects as $subject) {
+                    yield [$user, false, false, $subject, $attribute, VoterInterface::ACCESS_DENIED];
+                    yield [$user, true, false, $subject, $attribute, VoterInterface::ACCESS_DENIED];
+                    yield [$user, false, true, $subject, $attribute, VoterInterface::ACCESS_DENIED];
+                    yield [$user, true, true, $subject, $attribute, VoterInterface::ACCESS_GRANTED];
+                    yield [$user, true, true, $subject, 'something', VoterInterface::ACCESS_ABSTAIN];
+                }
+                yield [$user, true, true, new \stdClass(), $attribute, VoterInterface::ACCESS_ABSTAIN];
+                yield [$user, false, true, new \stdClass(), $attribute, VoterInterface::ACCESS_ABSTAIN];
+                yield [$user, true, false, new \stdClass(), $attribute, VoterInterface::ACCESS_ABSTAIN];
+                yield [$user, false, false, new \stdClass(), $attribute, VoterInterface::ACCESS_ABSTAIN];
+                yield [$user, true, true, null, $attribute, VoterInterface::ACCESS_ABSTAIN];
+                yield [$user, true, true, 'foo', $attribute, VoterInterface::ACCESS_ABSTAIN];
+            }
+        }
+    }
+
+    protected function getUser($id, $role)
+    {
+        $user = $this->getMockBuilder(User::class)->getMock();
+        $user->method('getId')->willReturn($id);
+        $user->method('getRoles')->willReturn([$role]);
+
+        return $user;
+    }
+}
diff --git a/tests/Voter/TimesheetVoterTest.php b/tests/Voter/TimesheetVoterTest.php
index 0f42822b..d47cb260 100644
--- a/tests/Voter/TimesheetVoterTest.php
+++ b/tests/Voter/TimesheetVoterTest.php
@@ -12,10 +12,10 @@ namespace App\Tests\Voter;
 use App\Entity\Customer;
 use App\Entity\Timesheet;
 use App\Entity\User;
+use App\Security\AclDecisionManager;
 use App\Voter\TimesheetVoter;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
-use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
 use Symfony\Component\Security\Core\Authorization\Voter\VoterInterface;
 
 /**
@@ -26,12 +26,13 @@ class TimesheetVoterTest extends TestCase
     /**
      * @dataProvider getTestData
      */
-    public function testCustomerIsDisallowed(User $user, $allow, $subject, $attributes, $result)
+    public function testVote(User $user, $allow, $subject, $attributes, $result)
     {
         $token = new UsernamePasswordToken($user, 'foo', 'bar', $user->getRoles());
 
-        $accessManager = $this->getMockBuilder(AccessDecisionManagerInterface::class)->getMock();
-        $accessManager->method('decide')->willReturn($allow);
+        $accessManager = $this->getMockBuilder(AclDecisionManager::class)->disableOriginalConstructor()->getMock();
+        $accessManager->method('isFullyAuthenticated')->willReturn($allow);
+        $accessManager->method('hasRole')->willReturn($allow);
 
         $sut = new TimesheetVoter($accessManager);